JVC KD-SH9750 User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.49831
2003/5
CD RECEIVER
4983120035KD-SH9750,KD-SH9700
TABLE OF CONTENTS
1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
Area Suffix
KD-SH9750
J -------------------------- U.S.A.
C --------------------- CANADA
Area Suffix
KD-SH9700
J -------------------------- U.S.A.
Detachable
ANGLE
RM-RK100
CD
FM
AM
CH
AUX SEL
VOLUME
R D
ATT
DAB
DISC
PRESET PRESET
DISC
EQ
3456 M21
D
SRC
DISP
ATT
SEL
BBE
MODE
KD-SH9750J
ARSENAL rogo
Line output level
WARRANTY 2 YEAR 1 YEAR 1 YEAR
4 V 4 V 2 V
KD-SH9750C KD-SH9700J
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
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1-2 (No.49831)
SPECIFICATION
Design and specifications are subject to change without notice.
If a kit is necessary for your car consult your telephone directory for the nearest car audio speciality shop.
AUDIO
AMPLIFIER
SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4 Ω, 40 Hz to
20,000 Hz at no more than 0.8% total
harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to
20,000 Hz at no more than 0.8% total
harmonic distortion. 0.8% total
harmonic distortion.
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz,
6 kHz, 12 kHz
Level ±10 dB
Frequency Response 40 Hz to 20,000 Hz
Signal-to-Noise Ratio 70 dB
Line-In Level/Impedance (KD-SH9750 only) LINE IN 1.5 V/20 kΩload
Line-Out Level/Impedance KD-SH9750 4.0 V/20 kΩload (full scale)
KD-SH9700 2.0 V/20 kΩload (full scale)
Output Impedance 1 kΩ
TUNER
SECTION Frequency Range FM 87.5 MHz to 107.9 MHz (with channel interval set to 200 kHz) 87.5 MHz to
108.0 MHz (with channel interval set to
50 kHz)
AM 530 kHz to 1 710 kHz (with channel
interval set to 10 kHz) 531 kHz to 1 602
kHz (with channel interval set to 9 kHz)
[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15,000 Hz
Stereo Separation 35 dB
Capture Ratio 1.5 dB
[AM Tuner] Sensitivity 20 µV
Selectivity 35 dB
CD
PLAYER
SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of channels 2 channels (stereo)
Frequency Response 5 Hz to 20,000 Hz
Dynamic Range 98 dB
Signal-to-Noise Ratio 102 dB
Wow and Flutter Less than measurable limit
MP3 (MPEG Audio Layer 3) Max. Bit rate 320 Kbps
WMA (Windows Media(R) Audio) Max. Bit rate 192 Kbps
GENERAL Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions (W x H x D) Installation Size 182 mm x 52 mm x 161 mm
(7-3/16" x 2-1/16" x 6-3/8")
Panel Size 188 mmx 58 mm x 17 mm
(7-7/16" x 2-5/16" x 11/16")
Mass 1.8 kg (4.0 lbs) (excluding accessories)
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(No.49831)1-3
SECTION 1
Precautions
1.1 Safety Precautions
!Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
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1-4 (No.49831)
1.2 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.3 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Pickup
Short-circuit point
(Soldering)
Flexible wire
Pickup
Short-circuit point
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(No.49831)1-5
SECTION 2
Disassembly method
2.1 Main body section
2.1.1 Removing the front panel assembly (See Fig.1)
(1) Push the detach button in the lower right part of the front
panel assembly.
(2) Remove the front panel assembly in the direction of the
arrow.
Fig.1
Front panel assembly
Detach button
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1-6 (No.49831)
2.1.2 Removing the top chassis (See Figs.2 to 6)
• Turn on power.
(1) Push the eject button in the upper right part of the front
panel assembly to move the front panel assembly as
shown in Fig.2 and turn off power.
(2) Remove the two screws Aattaching the top chassis from
the top side of the main body. (See Fig.3.)
(3) Remove the three screws Battaching the top chassis from
the both sides of the main body. (See Figs.4 and 5.)
(4) Remove the screw Cand threescrewsDattaching the heat
sink from the left side of the main body. (See Fig.5.)
(5) Remove the two screws Eand screw Fattaching the top
chassis from the back side of the main body. (See Fig.6.)
(6) Move the top chassis upward and remove it with the CD
mechanism assembly. The connector CN501 on the CD
mechanism assembly is disconnected from the connector
CN981 on the main board.
Fig.2
Fig.3
Fig.4
Fig.5
Fig.6
Front panel assembly
Top chassis
Eject button
Front panel assembly
Top chassis
AA
Top chassis
BB
Top chassis
Heat sink BD
C
EF
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(No.49831)1-7
2.1.3 Removing the mecha control board (See Fig.7)
• Prior to performing the following procedures, remove the top
chassis.
(1) Disconnect the card wire from the connector CN601 on the
mecha control board.
(2) Remove the five screws Gattaching the mecha control
board.
(3) Release the joints aand b, remove the mecha control
board
Fig.7
2.1.4 Removing the CD mechanism assembly (See Fig.8)
• Prior to performing the following procedure, remove the top
chassis.
(1) Remove the three screws Hfrom the inside of the top
chassis and remove the CD mechanism assembly.
Fig.8
CN601
b
a
G
G
Mecha control board
H
HH
CD mechanism assembly
Top chassis
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1-8 (No.49831)
2.1.5 Removing the motor assembly (See Figs.9 to 11)
• Prior to performing the following procedures, remove the top
chassis.
(1) Remove the spring from the motor bracket. (See Fig.9.)
(2) Disconnect the wire from the connector CN982 on the main
board. (See Fig.10.)
(3) Remove the two screws Jattaching the motor bracket.
(See Fig.10.)
(4) Remove the washer attaching the clutch assembly and pull
out the clutch assembly from the shaft. (See Fig.11.)
(5) Remove the two screws Kattaching the motor assembly to
the motor bracket. (See Fig.11.)
Fig.9
Fig.10
Fig.11
Spring Motor braket
CN982
Motor braket
Main board
J
KMotor braket
Motor assembly
Clutch assembly
Washer
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(No.49831)1-9
2.1.6 Removing the main board (See Figs.12 to 16)
• Prior to performing the following procedures, remove the top
chassis and motor assembly.
(1) Disconnect the flexible wires from the connectors CN703
and CN991 on the main board respectively. (See Fig.12.)
(2) Move the front bracket backward until it stops.
(3) Remove the four screws Lattaching the arm brackets (L)
and (R). Move the arm brackets (L) and (R) from the rod
gear. (See Fig.12.)
(4) Remove the rod gear.
(5) Remove the screw Mattaching the rear panel to the bottom
cover from the back side of the main body. (See Fig.14.)
(6) Remove the three screws Nattaching the main board and
move the main board backwards to release the two joints
c. (The main board will be removed with the rear panel and
rear heat sink) (See Figs.12 and 15.)
(7) Remove the screw Pand Qattaching the rear heat sink.
(See Fig.16.)
(8) Remove the three screws Rand screw Sattaching the rear
panel, then remove the main board. (See Fig.16.)
Fig.12
Fig.13
Fig.14
Fig.15
Fig.16
L
L
M
NN
Main board
CN991 Rod gear
CN703
A
rm
brackets (L)
Arm
brackets (R)
Rod gear
Main board
Arm brackets (L)
A
rm brackets (R)
M
Rear panel Bottom cover
Joint c
Joint c
Main board
Q
P
R
S
Rear panel Rear heat sink
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1-10 (No.49831)
2.1.7 Removing the lifter switch board (See Fig.17)
• Prior to performing the following procedure, remove the top
chassis, motor assembly and main board.
(1) Remove the two screws Tattaching the lifter switch board
to the bottom chassis.
Fig.17
2.1.8 Removing the lifter board (See Figs.18 to 24)
• Prior to performing the following procedures, remove the top
chassis and front panel assembly.
(1) Disconnect the flexible wire from the connector CN991 on
the main board. (See Fig.18.)
(2) Remove the four screws Uattaching the front bracket on
the both sides of the main body. (See Figs.19 and 20.)
(3) Push the pin of the joint don the front side of the front
bracket to release the detach lever. (See Fig.21.)
(4) Remove the screw Vattaching the connector cover in the
rear side of the front bracket. (See Fig.22.)
(5) Release the two joints fwhile pushing them from the front
side, and then move the connector cover in the direction of
the arrow and release the eight joints e. (See Figs.22 and
23.)
(6) Remove the two screws Wattaching the lifter board from
the front side of the main body. (See Fig.24.)
Fig.18
Fig.19
Fig.20
T
Bottom chassis
Lifter switch board
CN991 Front bracket
Main board
U
Front bracket
U
Front bracket
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
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